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it is given by sqrt(9/45) = 0.45
I've rounded to the 2 decimal places
The textbook shows a different answer. it shows 3 as the answer. Are we missing something? The question is exactly from the textbook. Please let me know. Thanks.
OK then you just need the standard deviation for one worker
which is just square root of the variance
stdev = √9 =3
sorry it was not clear from the question what is needed.
hope this makes sense.